You are a veteran Space Marine of the Imperial Fists Chapter. Equipped with powerful Terminator armour and armed with the deadliest weapons that the Adeptus Astartes wield, you are a symbol of the Emperor's might. Trapped aboard the space hulk Herald of Oblivion and the only survivor of your squad, you must fight your way through the aliens and heretics that infest the star vessel and find a way to escape the horror and return to your Chapter.